No microphone, no level meter, no recorder: the page does exactly one job, so nothing else asks for permissions you did not intend to give.
The preview keeps the whole sensor frame visible in a 16:9 box, so you can see what the edge of the shot looks like before a call.
Once the page is cached, the tool keeps working without a network, because the device and the page talk directly.
No mirror filters, no beauty effects and no background replacement: the preview is the raw device output, which is the only thing worth checking before a call.
The page asks for the camera and starts playing immediately, without a countdown, a scan or a setup wizard.
Frames stay between the camera and the page. There is no upload, no recording and no analytics on the video.